I believe the approaches are supposed to be part of Kessig but I would guess near Stensia as well do to the previous lord being a Markov vampire. Of course, Markov vampires are found throughout Innistrad so it doesn't have to be near Stensia. It also supposed to be one of the most remote areas but with about 3 villages.
There is also supposed to be a crossways near the Gatstaf Grotto, which complicates your map of Gatstaf. Where does this crossways come from if Gatstaf is at the end of a line. Perhaps there can be a road that leads off to the Approaches?
Glamdring, your Innistrad map is absolutely gorgeous, but I do have a quick question for you. The Art Book says that the Nearheath in Gavony comprises "the fertile, rolling hills within a few miles of Thraben" but according to your scale it appears that Videns, Wittal, and Effalen are 50+ miles from Thraben. The scale of the map is quite different as a result. Was this a creative decision or was there some other factor taken into consideration? It's obviously not a major issue and creatively I'm not opposed to it but Gavony appears much larger than I had envisioned as a result.
There is also supposed to be a crossways near the Gatstaf Grotto, which complicates your map of Gatstaf. Where does this crossways come from if Gatstaf is at the end of a line. Perhaps there can be a road that leads off to the Approaches?